Damper



No. 623,873-, Patented Apr. 25, |899.-

' A. BDRDEN.

DAMPER.

(Application led Aug. 17, 1898,) (No Model.)

STATES Nirn ArnNr Q' Fries.

DAM PER.

SPECIFICATION forming part of Letters Patent No. 623,873, dated April25, 1899.

Application filed'August 17, 1898. Serial No. 688,834. (No model.)

To LZL whom, t may concern:

Ile it known that I, ALBERT BORDEN, of the city of St. Louis, State ofMissouri, have invented certainV new and useful Improvements in Dampers,of which the following is a full, clear, and exact description,reference being had to the accompanying drawings, forming a partthereof.

My invention relates to dampers; and it consists of the novelconstruction, combination, and arrangement of parts hereinafter shown,described, and claimed.

Figure 1 is a vertical sectional view of a damper of my improvedconstruction, the same being shown in position in a i'lue orairconveying pipe. Fig. 2 is an enlarged horizontal sectional view takenapproximately on the line 2 2 of Fig. 1. Fig. 3 is a horizontalsectional view taken approximately on the line 3 3 of Fig. 1.

Referring by numerals to the accompanying drawings, 1 indicates asuitable rectangular casing that is located at any desired point in allueor air-conveying pipe 2. Formed in the center of the top of thecasing 1 is a small aperture 3, and formed in the center of the bottomof said casing isan opening 4, the same being closed by a plate 5,through the center of which plate is formed an aperture (5, and rigidlysecured to the under side of the plate 5 in any suitable manner is a cap7. Rigidly held upon top of the casing 1 is a vertically-arrangedtubular valve-casing 8, in which is formed a chamber 9, and in saidchamber J operates a piston 10. A tubular connection 11 leads into thecasing 8 at a' point above the piston 10, and a tubular connection 12leads into the chamber 9 below said piston 10.

The damper properof myimproved device comprises the tubular body 13,with which is formed integral the oppositely-arrangedoutwardly-extending wings or plates 14, and said plates 14, togetherwith the body 13, are of such size as that they will snugly iit withinthe casing 1, and when turned transversely therein will cut off andclose the passage therethrough. Formed in the top of the body 13 is avertical bore 15, that coincides with the aperture 3 in the top of thecasing 1, and

. formed in the lower end of the body 13 is a vertical bore 1G, thatcoincides with the aperture-6 in the plate 5. Arranged for verticalmovement through the bore 1G and the aperture is a short rod 17, thesame having formed in its periphery a spirally-arranged groove 1S, andalso formed in the face of said rod 17 is the vertically-arranged groove19, into which extends a feather 20, that is carried by the plate 5.Passing through the lower end of the tubular body 13 is a pin or bolt21, the inner end of which projects into the spirally-arran ged groove18. Rigidly connected to the upper end of the rod 17 is the lower end ofa connecting-rod 22, the upper end of said rod 22 being sea-ted in thepiston 10.

My improved damper is operated by discharging liquid under pressurethrough the tubular connection 11 on top of the piston 10, which forcessaid piston downwardly, or discharging liquid under pressure through thetubular connection 12 beneath said piston 10,

which moves said piston upwardly. lihenthe connecting-rod 22 movesdownwardly with the piston, the rod 17 moves downwardly through the bore16 and through the aperture 6 into the chamber within the cap 7, andsaid rod 17 does not rotate, owing to the fact that the feather 2Oengages in the groove 19 formed in said rod 17. As the rod 17 movesdownwardly and the point of the pin or bolt 21 engages in the grooveformed in said rod 17 the body 13 and wings 14 of the damper will bepartially rotated within the casing 1, which partial rotation will bringthe damper into a closed position, as shown by dotted lines in Fig. 3,thus cutting off `all passage through said casing 1, and consequentlythrough the flue or air-pipe in which said casing is located. Vhen therods 22 and 17 are elevated, the damper rotates in a reverse directionand is turned parallel with the side walls of the casing 1, and when inthis position there is a free passage through the casing 1.

A damper of my improved construction is sim ple, inexpensive, easilyoperated, will not easily get out of order', and is very effective whenin use in any flue or air-conveying pipe.

I claiin- 1. In a device of the class described, a casing, avertically-arranged damper within said casing, a rod passing through thecenter of said damper, in the periphery of which rod is formed aspirally-arranged groove, a pin IOO passing from the damper into saidgroove, means Whereby the rod is held against rotation, and suitablemeans for imparting vertical movement to said rod, substantially asspeeiied.

2. In a devieeof the elassdeseribed, a suitable easing, avertically-arranged damper arranged for rotation within said easing, arod passing through the damper and casing, in the periphery of which rodis formed aspirally-arranged groove, a pin passing through the body ofsaid damper, the point of which pin engages in the spiral groove, afeather carried by the under side of the easing for engaging in avertical groove formed in the rod, a valve-easing carried by the top ofthe firstmentioned easing, a piston operating within said valve-easing,to which piston is eonnected the upper end of a damper-rod, and suitabletubular Connections whereby fluid under pressure is discharged above orbelow the piston, substantially as speeilied.

3. In a damper, a suitable easing, atubular bod yarran ged for rotationWithin said easing, oppositely-arranged Wings formed integral with saidtubular body, a rod passing vertically through said tubular body, in theperiphery of which rod is formed a spirallyarranged groove and avertical groove, a pin passing through the lower portion of the tubularbody, the point of which pin engages in the spirally-arran ged groove,afeather carried by the bottom of the easing for engaging in thevertically-arranged groove, and means Carried by the top of thedamper-casing for imparting vertical movement to the rod, substantiallyas speoied.

In testimony whereof I affix my signature in presence of two witnesses.

ALBERT BORDEN.

fitnessesr M. P. SMITH, JOHN C. I-IIGDoN.

